A body composition scan estimates how much of your weight is fat, muscle and water, and shows where fat is stored, including visceral fat around the organs. It is a far better measure of progress than weight or BMI alone. At Boost & Glow we offer home and workplace body composition scans across Essex, Hertfordshire and London, from £59.
The short answer
- What it is: a quick, painless scan, usually using bioimpedance, that estimates body fat, muscle mass, visceral fat and body water.
- Who it suits: men and women who are training, dieting, using weight-loss support, getting older or simply curious, including people preparing for events such as Hyrox.
- How accurate it is: best for tracking change over time under consistent conditions. It is an estimate, not a medical diagnosis and not a DEXA scan.
- Who should not have one: anyone who is pregnant or has a pacemaker or other implanted electrical device.
- How often: about every four weeks. Body composition changes slowly.
What is a body composition scan?
Your body weight is made up of several components: fat, muscle, bone, organs and water. Standard scales add them all together into one number. A body composition scan separates that number into its parts, so you can see whether a change on the scales is fat, muscle or simply water.
That matters because two people can weigh exactly the same and look and feel completely different. Someone with more muscle and less fat will generally be stronger, burn more energy at rest and carry less fat around the organs than someone of the same weight with the opposite make-up.
What does a body composition scan measure?
| Measure | What it tells you | Why it is useful |
|---|---|---|
| Body fat percentage | The share of your weight that is fat | A better progress marker than weight alone |
| Skeletal muscle mass | The muscle you use to move, lift and run | Shows whether you are building or keeping muscle |
| Visceral fat level | Fat stored around the organs in the abdomen | A useful number to track, and one of the most motivating to improve |
| Body water | Total water in the body | Helps interpret readings and spot hydration swings |
| Basal metabolic rate (estimate) | Roughly what your body burns at rest | A starting point for sensible nutrition targets |
The exact measures depend on the device. At Boost & Glow you receive a clear summary of your results rather than a page of jargon.
How does a bioimpedance scan work?
Bioimpedance analysis (BIA) sends a very small, painless electrical signal through your body while you stand barefoot on a smart scale. Muscle and water conduct the signal easily, while fat resists it. By measuring how much the signal is slowed down, the device estimates how much of each tissue you carry. You cannot feel it, and the scan itself takes a few minutes.
How accurate is a body composition scan?
Bioimpedance gives estimates. It is most reliable for tracking change over time when you scan under the same conditions each time, because hydration, recent food, exercise and time of day all affect readings. A single result is a useful starting point, and the trend across several scans is where the value lies.
| Method | What it measures | Best for | Limits |
|---|---|---|---|
| Bioimpedance (BIA) | Fat, muscle and water estimates | Convenient tracking at home or work | Affected by hydration and conditions; an estimate |
| DEXA scan | Fat, lean tissue and bone using low-dose X-rays | Detailed clinic assessment | Needs a scanner and appointment; a different type of medical imaging |
| BMI | Height and weight only | A quick population-level check | Cannot tell fat from muscle |
| Tape measure and skinfolds | Waist size or skin thickness | Simple low-cost checks | Depends heavily on technique |
A bioimpedance scan is not a DEXA scan. If you need a clinical-grade assessment for a medical reason, speak to your GP.
Why weight and BMI are not enough
BMI only uses height and weight, so it cannot tell the difference between a person carrying a lot of muscle and a person carrying a lot of fat. The scales have the same blind spot. If you start strength training, you may add muscle while losing fat, and the number on the scales barely moves, even though your body is changing for the better.
The reverse also happens. When people diet without enough protein or strength training, some of the weight they lose can be muscle. A scan helps you spot this early so you can adjust.
Body composition for men
- Men often store fat around the middle first, which makes visceral fat a useful number to follow.
- Muscle tends to decline gradually with age unless it is looked after with strength training and enough protein.
- If you are cutting fat, a scan shows whether you are keeping muscle while you do it.
- Pairing a scan with a blood test shows energy, hormone and metabolic markers alongside your body composition.
Body composition for women
- The scales can hide progress, because water shifts through the month and strength training adds muscle while fat falls.
- Hormones and fluid can affect readings, so it is best to look at trends and note where you are in your cycle at each scan.
- Looking after muscle matters through the years around perimenopause and menopause, and a scan shows how yours is holding up.
- A scan is not suitable during pregnancy.
Body composition for Hyrox and endurance training
If you are building towards Hyrox, a half marathon or a triathlon, a scan gives you objective data to sit alongside your coach's plan.
- Protect muscle: track lean mass through a heavy training block or a fat-loss phase.
- Measure your build: scan at the start, then at weeks 4, 8 and 12. Twelve weeks is a common length for a Hyrox or race build.
- Add recovery data: if you wear a WHOOP, Boost & Glow Pulse lets you look at sleep, HRV and recovery alongside your scans.
Boost & Glow is not a coaching or sports medicine service. We support your training with data and general lifestyle guidance.
Body composition and weight loss
If you are dieting or using weight-loss support, the goal for most people is to lose fat while keeping as much muscle as possible. A scan before you start gives you a baseline, and rescans show whether the weight coming off is mostly fat. Questions about medication belong with your prescriber. A scan simply gives you more information to talk about.
Who should not have a body composition scan?
Bioimpedance scans are not suitable if you are pregnant or have a pacemaker or other implanted electrical device, such as an implanted defibrillator. If you are unsure, ask before booking.
How to prepare for a body composition scan
- Avoid hard training and alcohol for 12 hours beforehand.
- Drink normally, and avoid a large meal in the 2 to 3 hours before.
- Wear light clothing and expect to be barefoot.
- For rescans, book the same time of day so results are comparable.
How often should you rescan?
About every four weeks is a good rhythm for most people. Body composition changes slowly, and scanning more often mostly picks up day-to-day water changes rather than real change.
Where does biohacking fit in?
Biohacking means making small, measurable changes to your habits to improve how you feel and perform. The habits with the strongest evidence are the basics: sleep, nutrition, movement and recovery. A body composition scan gives those habits something to be measured against, so you can see whether a change is working rather than guessing. If you would like to start with the habits first, the Biohacking Basics Session is a 60-minute video session that works from anywhere in the UK.
Body composition scans at home in Essex, Hertfordshire and London
Boost & Glow brings the scan to your home or workplace, so there is nothing to travel to. Here is what is available:
| Service | What you get | Price |
|---|---|---|
| Body Composition Scan | Body fat, muscle, visceral fat and body water with a clear summary | £59 |
| Biohacking Baseline Session | The scan, a one-to-one review and a written personal plan | £109 |
| Biohacking Basics Session | 60-minute video session on sleep, energy, nutrition and recovery | £69 |
| Blood + Body Review | Scan plus a joint review of your blood results and body composition (needs a Boost & Glow blood test) | £79 |
| 12-Week Optimise Programme | Baseline Session, rescans at weeks 4, 8 and 12, three check-ins and a progress report | £299 |
| Body Composition Rescan | Follow-up scan with a side-by-side comparison | £34 |
See everything in one place on our body composition and biohacking page.
Frequently asked questions
What is a body composition scan?
A body composition scan estimates how much of your weight is fat, muscle and water. At Boost & Glow it uses bioimpedance, a very small painless electrical signal passed through your body while you stand barefoot on a smart scale.
How much does a body composition scan cost in the UK?
At Boost & Glow a Body Composition Scan is £59, a rescan is £34, and the Baseline Session with a one-to-one review and written plan is £109. Prices elsewhere vary depending on the method and provider.
Is a body composition scan accurate?
It is best used for tracking change over time under consistent conditions. Hydration, food, exercise and time of day all affect readings. It is an estimate and not a DEXA scan or a medical diagnosis.
Is a body composition scan different for men and women?
The scan works the same way, but healthy ranges differ, and for women hormones and fluid shifts through the month can affect readings. A good practitioner takes this into account when explaining results.
Is a body composition scan useful for Hyrox training?
Yes, it can help. It shows whether you are keeping muscle while you train or lose fat, and rescans at weeks 4, 8 and 12 fit a typical build. It supports your coach and plan and does not replace them.
How often should I have a body composition scan?
About every four weeks for most people, because body composition changes slowly.
Can I have a body composition scan at home?
Yes. Boost & Glow visits homes and workplaces across Essex, Hertfordshire and London.
Who should avoid a bioimpedance scan?
Anyone who is pregnant or has a pacemaker or other implanted electrical device.
Is this medical advice?
No. This article and our sessions give general lifestyle information and the scan gives estimates for tracking. They do not diagnose or treat conditions and do not replace care from your GP.
Ready to find out what your weight is made of?
See the full range of body composition and biohacking services, or contact us at sam@boostandglow.co.uk or on 07749 353899.
This article provides general lifestyle information and does not replace medical advice. If you feel unwell or have concerns about your health, speak to your GP, and call 999 in an emergency.
0 comments